1993 BMW 325 Cranks but will not start

1993 BMW 325i, inline 6
The engine will crank but it will not start
I have replaced the crankshaft sensor and fuel pump
I have done the starter fluid test and the engine turned over for all of 2 seconds before it died
I have noticed a second compartment in the driver side rear seat. It looks to be a second fuel pump. I am not sure if this is causing the engine not to turn. It is not mention in the manual and I am at a lose as to what to repair. I have noticed no gas seems to be coming out through the lines of the newly found fuel pump if it is indeed a fuel pump. Any guidance, tests, or replacement procedures for this second "fuel pump" would be much appreciated. Thank you
Known good items:
initial fuel pump
crankshaft sensor
Electrical components (starter, battery, alternator)
ignition system
plugs and wires